Headphone Transparency Control for External Sound Audibility
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Solution Overview
Problem
Audio devices with external microphone signal pass-through functionality struggle to balance environmental sound attenuation with the need to make external sounds audible, as media signals often mask external microphone signals, making it difficult for users to hear important external sounds while listening to media.
Innovation Solution
Implementing a method that adjusts the gain settings of both media and microphone signals based on user input through a graphical user interface, using a geometric shape on a display to control transparency settings and equalization curves, allowing users to intuitively manage audio parameters without requiring deep knowledge of audio engineering principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If headphone units significantly attenuate environmental sound, then media signal quality is improved, but external sounds become inaudible to the user
Solution Approach 1:
The audio signal is segmented into multiple components: media signal, environmental microphone signal, and bone conduction signal. Each component is processed and mixed independently to achieve both media quality and external sound awareness. The environmental microphone captures external sounds separately from the media playback path.
Solution Approach 2:
An environmental microphone is introduced as an intermediary device to capture external sounds that would otherwise be attenuated by the headphone units. This microphone provides a separate signal path that allows external sounds to be heard while maintaining media signal quality.
2Object-affected harmful factors
If external microphone signal gain is increased to make external sounds audible, then external sound awareness is improved, but media signal becomes masked
Solution Approach 1:
Different frequency bands and signal components are treated with different gain settings. The environmental microphone signal is boosted in specific frequency ranges where external sounds are most important, while the media signal maintains its original quality in other ranges. This selective gain adjustment allows external sounds to be audible without masking the media signal.
Solution Approach 2:
The gain settings for environmental microphone and media signals are made dynamically adjustable through a graphical user interface. Users can real-time control the balance between external sound awareness and media signal clarity, allowing the system to adapt to different listening scenarios and user preferences.
3Manufacturing precision
If complex audio parameter controls are provided for balancing media and microphone signals, then audio performance is optimized, but ease of operation deteriorates
Solution Approach 1:
A simplified graphical representation (geometric shape) is created as a copy or abstraction of the complex audio parameter controls. Instead of requiring users to understand and adjust multiple technical parameters, a single visual element represents the overall transparency setting, making the interface intuitive and easy to operate.
Solution Approach 2:
Multiple audio parameters (external microphone gain, media signal gain, equalization settings) are changed together as a unified transparency setting. By linking these parameters to a single user-controlled geometric shape, the system allows complex parameter adjustments to be made through simple user actions without requiring deep audio engineering knowledge.
Data Source
AI summary
A method of controlling headphones having external microphone signal pass-through functionality may involve controlling a display to present a geometric shape on the display and receiving an indication of digit motion from a sensor system associated with the display. The sensor system may include a touch sensor system or a gesture sensor system. The indication may be an indication of a direction of digit motion relative to the display. The method may involve controlling the display to present a sequence of images indicating that the geometric shape either enlarges or contracts, depending on the direction of digit motion and changing a headphone transparency setting according to a current size of the geometric shape. The headphone transparency setting may correspond to an external microphone signal gain setting and/or a media signal gain setting of the headphones.